The idea of Eren Yeager in a harem scenario is interesting because it takes a character from a serious and often dark story and puts him in a more light - hearted, relationship - focused situation. It allows for different character interactions that we don't see in the original work.
A prevalent theme is protection. Eren is usually depicted as the protector of his harem, and in return, they offer him emotional support. Also, the theme of growth is common. As the story progresses, both Eren and the members of his harem grow as characters. They learn from their experiences together, and their relationships also evolve. For instance, they might start off as just friends or comrades and then develop deeper romantic feelings. There's also the theme of sacrifice, where sometimes a member of the harem might be willing to sacrifice themselves for Eren's sake or for the sake of the group.
There are various 'Eren Yeager x Harem' fanfictions. Some stories could be about Eren being in a harem situation where he has to balance his duties and his relationships. Maybe in one, he is training to fight Titans while also navigating his feelings for multiple girls. These fanfictions often play with the existing character dynamics and create new scenarios for the characters to interact in.
One popular 'Attack on Titan Eren x Harem' fanfiction is 'Eren's Unconventional Bonds'. It delves into interesting relationships between Eren and multiple characters in a unique way. Another one could be 'Eren's Harem Adventures' which has some exciting plot twists involving Eren and his harem members. There are also many on fanfiction.net, you can search there using relevant tags to find more.
Not all texting stories are free. Some are, but many come with costs like ads or limited access without paying. You need to check the specific app or website to know for sure.
There could be 'Female Harem Around Eren', which focuses on how the different female characters in the harem support and interact with Eren during his various adventures. It shows their individual personalities within the harem setting.
One idea could be a story where Levi and Eren are on a dangerous mission together. They start off not getting along well due to their different personalities. Levi is strict and methodical while Eren is impulsive. But as the mission progresses, they gradually learn to understand and rely on each other. For example, Eren might save Levi from a Titan in a moment of quick thinking, and Levi in turn teaches Eren some crucial combat skills.
Another good one is 'Texting into Love'. Here, the reader is a huge BTS fan and randomly gets a text from one of the members. The way the author writes the texting conversations is so realistic. It makes you feel like you're actually reading real text exchanges between the reader and the BTS member, and it's full of excitement and anticipation.
One aspect of Levi x Eren family fanfiction could be the exploration of their relationship in a family - like dynamic. It might involve how they support and protect each other within this new family structure. For example, Levi could be a strict but caring figure, while Eren is the one with new - found responsibilities in this family.
Armin is often a popular character. He might be like a wise uncle figure to Eren and Mikasa's family, offering advice and support. Another could be Levi. He could be the strict but caring mentor to their children, teaching them important skills.